hjtran opened a new issue, #34703:
URL: https://github.com/apache/beam/issues/34703
### What would you like to happen?
The failure message for passing a pipeline object to a transform that
expects a PCollection doesn't point a user to the underlying issue at all
```
with beam.Pipeline() as pipeline:
_ = (
pipeline
| beam.Map(print))
```
Results in:
```
...
File
"/usr/local/lib/python3.10/site-packages/apache_beam/runners/pipeline_context.py",
line 95, in get_id
self._id_to_proto[id] = obj.to_runner_api(self._pipeline_context)
File "/usr/local/lib/python3.10/site-packages/apache_beam/pvalue.py", line
187, in to_runner_api
self.windowing))
File "/usr/local/lib/python3.10/site-packages/apache_beam/pvalue.py", line
158, in windowing
self._windowing = self.producer.transform.get_windowing(
File
"/usr/local/lib/python3.10/site-packages/apache_beam/transforms/ptransform.py",
line 563, in get_windowing
return inputs[0].windowing
AttributeError: 'PBegin' object has no attribute 'windowing'
```
### Issue Priority
Priority: 2 (default / most feature requests should be filed as P2)
### Issue Components
- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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